Checking After Adjustment; Test Points For Tape Path Adjustment - Sony SVT-RA40 Service Manual

4-3-5. Checking After Adjustment

1. Play the alignment tape (VHJ-0006) and check that the
envelope waveform is activated immediately and that
there are no fluctuations in the envelope waveform or
the audio output waveform.
2. Load a cassette tape (T-120) and use it to record and
replay. Check that the envelope waveform is activated
immediately and that there are no fluctuations in the
envelope waveform or the audio output waveform.
(When recording on the tape, input 1kHz to the audio
input terminal. Use a scratch-free cassette tape (T-
120). )
Check that at the tracking centre, the front half down
and back half down are not more than 20 % of the
value at the point where the envelope waveform
amplitude is at its maximum.
3. Check that the envelope waveform is activated
immediately when you switch from PLAY to REV or
from REV to PLAY. Check that there is no slack in the
tape next to the pinch roller.
4. Check that the envelope waveform is activated
immediately when you switch to PLAY from FF,
REW, CUE, REV or STOP mode. Check that there is
no slack in the tape next to the pinch roller.
5. Check that the tape is not curling or riding up on the
upper or lower flanges of the tape guides in PLAY, FF,
REW, CUE or REV modes.
6. Check that in PLAY mode, the tape runs as shown in
Fig. 4-3-7.
7. Load a tape (T-160) and play it back. carry out the
checks described in steps 3 to 5 above.
S tape guide
S guide
No.0 tape
roller
guide
Full erase
BT post
head
2-38
5. Test Points for Tape Path
Test points TP182 (ENV) and TP183 (SW-P) for tape path
adjustment are shown in figure below.
Audio R/P head assembly
(ACE head)
Cylinder
(drum)
T guide roller
Fig. 4-3-7
Adjustment
CP-1 PWB (Foil side)
Fig. 5-1
T tape guide
Pinch roller
Capstan shaft
TP101
VR111
VR131
TP102
TP182
TP183
Loading guide
post
SVT-RA40/RA168